diff --git a/lectures/_toc.yml b/lectures/_toc.yml
index 302a0a0b..60348f49 100644
--- a/lectures/_toc.yml
+++ b/lectures/_toc.yml
@@ -12,29 +12,32 @@ parts:
   - file: oop_intro
   - file: names
   - file: python_oop
-  - file: workspace 
-- caption: The Scientific Libraries
+- caption: Foundations of Scientific Computing
   numbered: true
   chapters:
   - file: need_for_speed
   - file: numpy
   - file: matplotlib
   - file: scipy
-  - file: pandas
-  - file: pandas_panel
-  - file: sympy
 - caption: High Performance Computing
   numbered: true
   chapters:
   - file: numba
   - file: parallelization
   - file: jax_intro
-- caption: Advanced Python Programming
+- caption: Working with Data
+  numbered: true
+  chapters:
+  - file: pandas
+  - file: pandas_panel
+- caption: More Python Programming
   numbered: true
   chapters:
   - file: writing_good_code
+  - file: workspace 
   - file: python_advanced_features
   - file: debugging
+  - file: sympy
 - caption: Other
   numbered: true
   chapters:
diff --git a/lectures/sympy.md b/lectures/sympy.md
index c0c9afa0..a79c8d30 100644
--- a/lectures/sympy.md
+++ b/lectures/sympy.md
@@ -712,4 +712,4 @@ solve(Eq(log_bino_diff, 0), θ)[0]
 ```
 
 ```{solution-end}
-```
\ No newline at end of file
+```